Linux search and replace string command

I found this Linux command on the web to search and replace a string in files.  What does + do at the end of this command?

find . -type f  -exec sed -i 's/foo/bar/' {} +
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Zsolt PribuszConnect With a Mentor Commented:
Here is a part from find manual:

       -exec command {} +
            This  variant  of the -exec option runs the specified command on
            the selected files, but the command line is built       by  appending
            each  selected file name at the end; the total number of invoca-
            tions of the command will       be  much  less       than  the  number  of
            matched  files.      The command line is built in much the same way
            that xargs builds its command lines.  Only one instance of  '{}'
            is  allowed  within the command.      The command is executed in the
            starting directory.

Link to find man page:
Link to stream editor (sed) man page:
Try this:

find . -type f  -exec sed -i 's/foo/bar/' {} /;
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